Davidson Defense Marathon w/SBA3 Brace 14.5-inch Carbine-Gas 5.56 NATO AR-15 Pistol Full Build Kit Pin/Weld Ready with KAK Industry A2 Extended Flash Hider

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The Davidson Defense Marathon 14.5" Carbine-Gas AR-15 Pistol Full Build Kit delivers a durable and compliant-ready foundation for your next 5.56 NATO build. It features a 14.5" government profile barrel made from 4150 CrMoV steel with a phosphate finish, a 1:7 twist rate, and a carbine-length gas system paired with a 0.750 gas block for reliable cycling.

The included KAK Industry A2 Extended Flash Hider, when installed, brings the barrel length to meet rifle standards, making the kit pin-and-weld ready—though not yet permanently attached. The upper receiver is made from 6061-T6 aluminum with a corrosion-resistant anodized finish, and the 12" M-LOK handguard allows for versatile accessory mounting. A nitride-finished 9310 steel bolt carrier group, mil-spec M4 charging handle, and an SB Tactical SBA3 adjustable stabilizing brace round out this complete, high-performance AR-15 build kit.

Specifications

Caliber: 5.56x45mm NATO

Barrel Length: 14.5-inch

Barrel Material: 4150 CrMoV

Barrel Finish: Phosphate

Barrel Profile: Government

Barrel Twist Rate: 1:7

Barrel Thread Pitch: 1/2x28

Gas System Length: Carbine

Gas Block Size: 0.750

Upper Receiver Material: 6061-T6 Aluminum

Upper Receiver Finish: Anodized

Handguard Material: 6061-T6 Aluminum

Handguard Color: Black

Handguard Style: M-LOK

Handguard Length: 12-inch

Bolt Carrier Material: 9310 Alloy Steel

Bolt Carrier Finish: Nitride

Charging Handle: AR-15 M4 Charging Handle Mil-Spec Quality

Pistol Brace: SB Tactical SBA3 Adjustable Pistol Stabilizing Brace - Black

Muzzle Device: A2 Extended Flash Hider

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Davidson Defense Marathon w/SBA3 Brace 14.5-inch Carbine-Gas 5.56 NATO AR-15 Pistol Full Build Kit Pin/Weld Ready with KAK Industry A2 Extended Flash Hider

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